Journal box for the crank and pitman connections of mowing machines



Sept. 14 1926.

J. TREZONA JOURNAL BOX FOR THE CRANK AND PITMAN CONNECTIONS OF MOWING MACHINES Filed Oct. 20, 1925 WI'III gwwmto o @7071)? 27 2202742;

Patented Sept. 14-, 1926.

UNITED STATES PATENT TFMCE.

JOHN TBEZONA, OF ST. ONGE, SOUTH DAKOTA.

JOURNAL BOX FOR THE CRANK AND PITMAIQ' GDNNECTIONS 0F MOWING MACHINES.

Application filed October 20, 1925. Serial No. 63,710.

This invention relates to journal boxes for the crank and pitman connections of mowing machines and has for a particular object thereof the provision of a device of this character from which the brasses may be very readily removed and replaced.

A further object of the invention is to provide a device of this character having means for efficiently lubricating the crank connection.

A further and more specific object of the invention is to provide a device of this charactor in which both of the brasses are loosely mounted in the connection and one of the brasses serves to lock the other brass against withdrawal so that the locked brass which is ordinarily fixed in the connection may be loosely mounted and at the same time securely held against accidental displacement in the direction of its longitudinal axis. By this structure, the crank pin brass is permitted to revolve with as Well as about the crank pin so that the wear thereon is distributed and the brass will accordingly not wear egg-shaped. The pitman brass being enabled to partake of a slight amount of movement transversely of its longitudinal axis will cushion the shocks met in changing direction by its slight movement and at the same time will hold the arms connecting the pitman strap to the boxing in spaced relation to the walls of the casting employed in the construction of the boxing, thus preventing excessive friction and wear.

A still further object of the invention is to provide a device of this character reduc ing the strain usually placed upon the connection in the operation of the machine.

These and other objects I attain by the construction shown in the accompanying drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention and wherein Figure 1 is a horizontal sectional view showing a journal box for the crank and pitman connection of a mowing machine constructed in accordance with my invention;

Figure 2 is a section taken at right angles to the view shown in Figure 1;

Figure 3 is a side elevation of the bushing 15.

Referring now more particularly to the drawing, the numeral 10 indicates a journal box casting having bores 11 and 12 formed therethrough at right angles to one another, these bores partially intersecting, as shown. The bore 11 receives a brass 13 for engagement with the crank pin 14 of a mowing machine while the bore 12 receives a brass 15 for connection with the pitman 16. In the usual construction. the pitman 16 has spaced arms 17, each having a conical projection 18 upon its inner face extending into a similar socket 19 formed in the co acting end of the brass 15. A bolt 20 directed through the arms serves to prevent escape of these conical extensions from the ends of the brass.

It will be noted that the brass 13 is made of a size to lit its bore 11 and accordingly projects into the bore 12, as at 21, and into a notch 22 formed in the brass 15 for its reception. This construction effectually prevents disengagement of the brass from its mounting, no matter how loosely the brass may be mounted within the bore 12. Accordingly, both brasses 13 and 15 may be loosely engaged in their bores so that they may be readily removed at any time for replacement which is often necessary and yet if the pitman connection is merely removed for some purpose, the brass 15 is firmly held in this position and cannot become loose from the casting 1.0 as long as the bushing 14 remains therein. The bushing 13 is retained in position upon the pin by means of a flange 23 of a nut 24 mounted upon a reduced threaded extension 25 of the crank pin 14. This flange has openings 26 formed therethrough permitting the passage of oil to the brass 13.

The exterior of the outer end of the wall of the bore 13 is screw threaded, as at 27, for the reception of anoil or grease cap 28, which cap is held in adjusted positions in its threaded engagement by means of aspring clip 29 secured to the wall of the casting and adapted for selective'engagement in notches 30 formed in a flange 31 provided upon the exterior of the inner end of the cap 28.

It will be noted that with a construction of the above character the brass 13 may rotate within the bore 11 and the crank pin may, of course, rotate within the brass 21. Consequently, this brass 13 is constantly changing its position and there is no tendency whatever of the brass to wear in an eggshape with the result that it is considerably longer lived than in the ordinary construction. It will also be noted that while the bushing 15 is held against longitudinal displacement, it may; partake of a slight movement transversely of its longitudinal axis and this movement enables the brass to take up a certain percentage of the shock and jars ordinarily transmitted to the cast ing 10 by the pitman strap 16. The conical depressions 19 in the ends of this bushing areiinade of such depth that the attaching arms 17 are maintained in spaced relation to the end walls of the bore 12 so that no frictional engagement is had. thus reducing wear both upon the arms and boxing.

It will, of course, be obvious that the construction hereinbefore set forth is obviously capable of a certain range of change and modification without materially departing from the spirit of the invention and 1 accordingly do not limit myself to such specific structure except as hereinafter claimet.

1. A journal box for the crank and pitman connections of mowing machines and the like comprising a casting having a pair of bores arranged at right angles to one another and partially intersecting and a bushing loosely fitted within each bore, one of said bushings having a notch into which the external wall of the other of the bushing extends, a crank pin extending through the last named bushing and having a reduced extremity, a retaining nut on the crank pin having a flange overlying the end of the bushing, said flange having openings therethrough.

2. A journal box for the crank and pitman connections of mowing machines and the like comprising a casting having a pair of bores arranged at right angles to one another and partially intersecting and a bushing loosely fitted within each bore, one of said bushings having a notch into which the external wall of the other of the bushing extends a crank pin extending through the last named bushing and having a reduced extremity, a retaining nut on the crank pin having a flange overlying the end of the bushing, said flange having openings therethrough, the other end of the casting concentrically with the last named bushing being extcriorly screw-threaded. a lubricant cap threaded thereon and having a flange and a retaining spring carried by the casting and adapted for coaction with notches formed in said flange.

In testimony whereof I hereunto my signature.

JOHN TREZONA. 

